Crayon Shin-chan

``` jiang@jiang-virtual-machine:~/hehub/examples$ g++ -Wall -g -o ckks ckks_example.cpp In file included from ckks_example.cpp:1: /usr/local/include/fhe/ckks/ckks.h: In function ‘hehub::ckks::CkksPt hehub::ckks::encode(hehub::cc_double, const hehub::ckks::CkksParams&)’: /usr/local/include/fhe/ckks/ckks.h:124:17: error: missing template arguments before ‘datum_rep’ 124 | std::vector...